Me and a friend were wanting to play pixelmon on a hamachi server i made but from the many different attempts of changing the forge version (11.15.1.1722-11.15.1.1902) we tried may different version and the only time his ping wasn't over 1000 was with no mods in the server and we tested that any mod we had on the server was causing him ping lag. (Mods like iron chests or custom npcs mods that add blocks and mobs to the game, side mods like jei or journey map didn't cause ping lag) from the testing all i can gather is that some problem is with forge because i have hosted servers for 1.7.10 and 1.10.2 and only minecraft v1.8.9 had caused this ping lag. If anyone has any idea why this is happening i would love to hear.